Part 1 of Audio/Video recording of a class lecture by Prof. Raj Jain on Introduction to Cellular Networks: 1G/2G/3G. The talk covers Cellular Frequency Reuse, Characterizing Frequency Reuse, Frequency Reuse Example, Frequency Reuse Notation, Fractional Frequency Reuse, Cellular Telephony Generations, 3.9G vs. 4G, GSM, GSM Cellular Architecture, GSM Radio Link, GSM Specs, Cellular System Capacity Example, GPRS, GSM/GPRS Network Architecture, EDGE, W-CDMA, High-Speed Packet Access (HSPA), Evolved Packet System (EPS). Slides can be downloaded from the course website URL given at the bottom of all slides.